ASTM TM29 Thermal bimetal strip

shop sign                                   TM29

High expansion layer                  Ni20Mn6

middle layer                                ---------

Low expansion layer                   Ni36

Chemical composition

performance

Than bending K(20~135ºC)                                             15.0±5%

Temperature curvatureF/(greenhouse ~ 130 ºC)             28.5%±5%

resistivity(μΩ·m)                                                                0.8±5%

Density (g/cm3)                                                                 8.1

Thermal bimetal strip is by the different expansion coefficient of two or more than two layers of metal or metal solid combination, and along the entire interface varies with temperature and the thermal function of shape changes in composite materials.One of high expansion coefficient become active layer, low expansion coefficient becomes passive.When requirements with high resistivity, but heat sensitive resistance performance is essentially the same type of thermal bimetal series, can be added between the two layers of different thickness of middle layer as a shunt layer, is to achieve the purpose of control

different resistivity

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